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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95ddb0aa5f29d0c7c03b3e2b7436c71f0826de54bb60ae7fd8cbdbda16d72598' 
  AND token = 'Y5eekctsBVxHBegpDpTUrTW1AuUlRZufOg2BL/7VLp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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