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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e23a0eb24cb9a2510badda136e4f0ef50509bff262b08924871a6724656822' 
  AND token = 'qpNi5kg3fRk52/3o+84+5N3zVG/PPRUb+p6Waa9wmQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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