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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '962df917b0bb0caeeeef1ba5c9de2c629f63dbf65862323ba48fc0b02a6491ae' 
  AND token = 'ejQjm+p9jgr+KQm8RURYPTkg3od8rNTr9VqVQfQJmLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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