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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c811f349f162220fbb3261aa0fafd92e771c10cd9f493473e25c64c5f5e41a7c' 
  AND token = 'TcAl7h2KbrTS7RctJ+vglAsjys8iwZ51iRACt/yq6pU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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