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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c3e50e6fa519c09ecad81c14c8e13d9228277bc8aebe02eaf45c1ffc21d10e5' 
  AND token = '9KyYLP1MiMpO5kgLPI5NIIiEOAYLjeDSdayLqbouSYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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