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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61029ecf255af402b495c5ea1425da1b8b5845004ab15b4ce196e9db7c49b9ce' 
  AND token = 'rxFJkrR8uIw5vvGAloT7Gy3EvX5Meqp+CND4K28PNxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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