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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd2e984e1d32d963f3cb425a53f4475e62f391934a860c234cf1ca70790cd54' 
  AND token = '8aLqqfKMw81JMyuSgVncnMIFMEAvrR/7cpxJGHe2NMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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