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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffb795e4e5278fc8560761f0535b91d6104d0f5e4ccdc29f7c7a58e78c8b8fb7' 
  AND token = 'LnGcFellCeubOFcAy0w/DyQcyIfmSvTYYriQ2i1aUpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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