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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c674fefbd8dd5ea93b6c24c707816a8f0c52985e05895f9506525d965c3efee6' 
  AND token = 'qzOmnQlG3rSZy4WcRQdI1XptFJMWYPxZdOqJcb+VUbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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