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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '142598f9a6b6d3b9ba5f5c92797630bf6d46cc10fcfec2a58afc3bcaa4b17b14' 
  AND token = 'qHyr8YbyVFH09sitLZknRQC5pQhkiuWRqDA+ydfTS/8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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