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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289a5ce201af769e9aa2ce57c4253758116ac148424a6f1498197b7c44e306f0' 
  AND token = 'UiFWnfyZPEyentEfDZOFSKwR07Tyog5NonPHcPAwQiQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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