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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdabcf50e3b04b930ac235c34dc634dc2e049c4b54386ae1b1d58047fcada915' 
  AND token = 'HvRD8VRTKbtTK4+bwA06o7Cgl15TCienLLys+2gPldw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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