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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04ea5922eeb2d0063deb1a89d1fda05cda0959de542705d2db0b6ef5116ed3d3' 
  AND token = 'TeA6CThEDr17v1E9z1X2H/BpPn8IdlC9DvD9B5J7Od0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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