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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8954c97deea03cef4d9427b894ea32559d1e3922657fd74e51c36a95c0cb1179' 
  AND token = 'ITRNwhtOQnj9+ZKA5SFLx0lL9wnqLC4i27nqipt/jWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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