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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdbdcd2fe3c70cdced4bf1b674579c109877262b8e5ee711b795089fd85823d5' 
  AND token = '4jPgRKQ5WXSjItWHN39Ajcv5GnQkGett1qPVDP+/obQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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