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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7a8e826e76c755cb6cfa447a375d8d33d8156c7279038f160ee2eee764eccf0' 
  AND token = 'AsraVoEWpcqO3ebF4Qnp86zgdmCiAuvIq3LHQxfHyGg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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