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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aafbe22e8a74101384bff85493009d9a8be98555ddaeab3147cf572448202b7' 
  AND token = '4dmA5QzBlDf8elpvqqesVIq0ebo0JvBvcPjYHCgVKqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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