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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8bd25fc96f3c12469d360edb083c051af9c2e5f259b22f62c2e7bb1848d1632' 
  AND token = 'ppf7mGZWZNGwQuJbZn0b5wILSZaRZE2WFTBB7U1fKg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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