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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a7b3594bbef736d35e96464e11d7f1117b09ee25334433b9bdb7403cf767a91' 
  AND token = 'JFOjd25epOqIrDAn0hUWQBftTK2fTLXsP1em3GREQG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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