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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63fb1a92cc895c20d5e640b16ed1c17e0adc1788429586f3413558054e744ca0' 
  AND token = 'Hp5LSmon4eX3I1dw7gAXkdxnpRSTJhn3nuXRVrPVHg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}