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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d518b2b300ade6f2595bebb59edfa882e8c3dc4b4f2cbd52b11295d8a731a4a' 
  AND token = 'lnbKJredbChIr1DqCOWnQjSm/9lwbG6Md8TmoD0mavM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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