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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8eecbfce9a6417a4b654f07aff65457909b8a40eb9b27f44a353587d013265ad' 
  AND token = 'os3wuiMjjohi9zE8IjCG4lAcTWYSF8n6hBBgtSf5ask=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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