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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826850fb94f06ff9c228e6ec7d7e5d859ca9937bd9c0acf478aab3fac4731162' 
  AND token = 'uKf1ld9a3ER+1j9FuW6b7DZykgnJ3no598FoCDillZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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