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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe86f8e9459bf7fd81f66e8f2fc3ef335930392c3bba25ed1e637a874addb976' 
  AND token = '08cN89AmT5WxaEuwhnp8/oG6FN6/HTwcjW3vHJWv9Ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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