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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42c5056c0330b1ca40e491de5717ab08afb04246f70523cfd5ec0d0e9a320933' 
  AND token = 'cuPiKrI90I+NV3jzBM6y23klXW/8Z+sY/iVZOl/Tyds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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