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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcb73340bcc7f23bf42b8b3624815d5aa54a50bdec1c87f67a43e680c61871b7' 
  AND token = 'opAKCVtvw2cJHZNxGDCsSmTX2DfVwJSW9/VkkP57/1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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