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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96903a50b2f3bf8b0154ec83a4c8894bb16570a367064300a55f4e25904c9a10' 
  AND token = '/L/xZVYZfyGDNlCl3udacAhrXbOwEI0QGljkGRZUdO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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