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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10bb9fd4e9acbff16c0e1e5d722fb5a71c061d89a711095a493095a9c7a3bbc8' 
  AND token = 'tTN+3OnD1ZlaXOuO7+brFuLmRM9rdiL/9HhCdT+5z/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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