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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd310e62786850d9f0323c7ae086fd7c00de276573ed3f2cfc7dc3ea5c21bf3' 
  AND token = '8LtiyvrIMWpziDwbVI3G5bac8Tn/ODu596G8yfgieaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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