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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c6b5e71d7ee444b3dd018e13c2e675ef92d369e193fa2904807ecd919ae07eb' 
  AND token = 'ZgZKFv2T4BKFEZauAZK5JYprIYCXAFqYquPvwyks29w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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