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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925924a4c7bf2073aab2c6b913f2fafaa4f030fdad4874e748e3b48d6644f76a' 
  AND token = 'BLHC9GSCGmA/Ex671kKnbF/hE02aKbTom5mlDlm+Ndg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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