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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19a6c4b344687b435610c5e9137005fd9c38e50c0392f3e85f42486f1352e35' 
  AND token = 'QWphqKmlSPJlR4Q3Mx7e83D0em3WTOHSjsm0b5cAhm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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