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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20bb7f1a6e3eb5baf1e8abba6f5424e6800806238e4e2835d3f90c5b2c9c74da' 
  AND token = 'Ie/Fedt/W3jUQ+Zv4HQ5J95HWcaHoh95U7TVdI6clqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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