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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bbbee5fa53569f9198e279cd63a6b5eb52008be8e4dea6f69f245b0297ee77a' 
  AND token = 'lwDp9lkbtTJdZFcFTsuY2ed7V2uVQo2WpkOW6JH/V4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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