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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33fec15d242f5054dd8c08722023fcbe45ee2b35d97fe2df727e5a0149648a93' 
  AND token = 'pimvLIN0IJYl5DvOup/jOXFJo/j2+enSPs2/3/Kdago=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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