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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9723288bf9e78623562798707e40045e69e7f6d6ac1bffb7d7ed2ae838983a0f' 
  AND token = 'FnAszKurK5LyJ7Er8e03gySdiS1gq9Cdb+JJBWX5CqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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