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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4db1447b08bcf4b6ca0cbd477f85aecbead8cffe747a69fa4ed0655a7d93cce9' 
  AND token = 'vsjJNdA8Bb2APq60ImlpT8srd9WYDs0r9Ono27Qd4j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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