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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689d59b2f06507e4b8d0484d1ad51c9519ad8a1558b1dae939a019b4567fc2c6' 
  AND token = 'Xpb0XVBKawchWs3L4G9nijDqhrS3GlOAA/4JtNyksJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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