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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f6a8ffad17a9691fe9cf97ad1f1bea136869bda0ac89a1128dff04fbc43e7ff' 
  AND token = 'gKhAgcqRPKH3UXqV5FJhvCi3YB8fCUpV5I2orPg3b00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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