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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974e54b2983d59669bcb0ff8c3c6dd13c1a1d150a935eab8e9c45b593c25522c' 
  AND token = 'p/Fkei3kNLfLGnupTi7xqnw5ZCj/QcQuUylfyqKeFm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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