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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b7b8aa43c39f20301ccb1f9deb86819c3f5b1f98ded2fe498798c61bf2b3f24' 
  AND token = '3zwo8UH60dzwJCXEYlJT61gXkLydYVk+0FCENdKiLHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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