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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0da873c6309b552a8009a84f0b611918849bfe162c3e3c8bcce8cc057d8a916' 
  AND token = '1TJhdLZ421ecZipBzmwhDuc7J92QD3Rs7PQtv8JG5Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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