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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17f3608398407f2f65a5001da717fd656446a356a4b4a06fa3be5a363e4f0b58' 
  AND token = '7c9m5TriBL33ZAX7T2e2duj/c1lSSdhmrmu6OKKOuO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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