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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1a95d5ddfda2e02cfc039721e1b8745330e5708744d9dad6829451efb72760' 
  AND token = 'g0VGFDk6k6rP9C6QLUymUzX/JZicrKw30dMUgLRsc+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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