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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cd2ad64d974cd813973c4cc8222f166498390e4e6a804bb14b1b57b99d6ecc2' 
  AND token = 'MLWK22rjseFf0sZz6k2BvFY9oFQ76Urr6jFvJcu+rRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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