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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635c5c741e7554219464e969f65d7b1ae01c79f91ced80fe4cd8bbd49d37a28b' 
  AND token = 'JDOOgULPukpieuKYGPVAR1ogEFy5X3A6HPaJXQbpimc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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