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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363a52ddfb085b84280a50f44c9f53c1bafe8fef2aa5cebf04c5ad16b7d52908' 
  AND token = 'JE5LgjNJdqGB5j1Tv7+T3ZzXilxc6sE61Xr7aCUY3mQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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