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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a53e9862962029c119c2d6d4091774f37253d4abc5aac323c8bd6714f5c9187c' 
  AND token = 'U0e2TgUxQmDEY8tD1WPPuI4Cxt3t9KzM2fHdFpL/xO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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