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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ca97f9a89b8e4915b29a5381a7a0eaeff390895dc853c821be119a64b4b01a' 
  AND token = 'eXuTSHNcs05IjepR3WhDlTEw6XajEUBKrJKZdqbxZCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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