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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6447d0958947885b5620e4a5e10f60165fb1a453b51258667c5df5ed87a2fe13' 
  AND token = 'PNx5UsR4pdluIV/3bgZv42jJMDu/qGW7y9/60vNforU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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