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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f99d79bb68c760ed873e590ecdb6ca3334adef4a5fa8a51b255d42c29ef83ae' 
  AND token = 'MCJLuI+hJ5tk5odP8//9ggJLBAZVXOUL3RZggQauDsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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