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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44821bd68ddb6a9266c62fb655c4d7325261e48c0f8ba5ab28ec54bc64ff43b2' 
  AND token = '2Z6yxl6vlOgE+3ZgHEh3soNlYnAX8u83osGlHx3oi08=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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