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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '519a5b18faced8c8c402b52a5b15f3cf9418e7fab392df3cf356182ab31a5002' 
  AND token = '3GGu6Vp9cEmF7IQB2xbquhwGF6WED01IcqbqajUIkxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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