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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce764866b13bf598aae3c364352b443dc7fb8546932b71c934ee3b72a0e095fc' 
  AND token = 'x4JGOeAF9YDK//gOAMuj56w3GGQfLLYdDQNn7D5uzCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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