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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55cf0112a2f964c565c7dd55a379adb60024cb3bbf39326f6d8585dfa9aff684' 
  AND token = 'UFiZzO0tkik02m1U3ABQnKjv682MoLsr0VVE3eqc498=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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