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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f6e0b038c7c82df4a12740a4020e0570232b6c671c4a5ae8ff87098169066a' 
  AND token = 'h/YnQSB312Ja6C3DZgijqKI5ASOSbyHBP9QgeQiRGxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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