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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae16ff87abd2e1d78b20083e35852be1100829db58f58800ee4e179e67971073' 
  AND token = 'WvxTYVamB+UBmE3fAeE3aLzt+L/rPfrjhJX39sAff5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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