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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4ab5be490debce3db6265f6e3e149b4fe6134aced4804814a1dca540c9f60fc' 
  AND token = '0WN5P5uVFT1BHRHITN3sv+mUHmghPwKvp2t/dyelBWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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