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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efe7b7a2699030a6be536c67cfb17ff6bfad19e3ae7ea17be35914d05a698c70' 
  AND token = 'gMj93ApWRfI8FRJqMC8b/uN4CBBuWkdJ9CZ9pHS0JG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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