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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b094a89970d357477ff7ce297ad7aee04709d4d992a3b75e2c8079a54d2a69e' 
  AND token = '+anjXF/N9TPy5xT9rXB5VO/FCVOztBxxc8CR3zmuiXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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